Fill a small test tube halfway with copper (II) sulfate solution. Add a 2.0 gram iron rod to the solution and observe the reaction.…
Time allowed 45 minutes Instructions Use black ink or black ball-point pen. Fill in the boxes at the top of this page. Answer all questions. You must answer the questions in the spaces provided. Do not write outside the box around each page or on blank pages. Do all rough work in this book. Cross through any work you do not want to be marked. Information The marks for questions are shown in brackets. The maximum mark for this paper is 45. You are expected to use a calculator where appropriate. You are reminded of the need for good English and clear presentation in your answers.…
In a saturated solution of silver phosphate, the concentration of silver ion is 4.5 10-4 mol/L. The Ksp of silver phosphate would be which of the following?…
Electromagnetic radiation behaves both as particles (called photons) and as waves. Wavelength () and frequency () are related according to the equation…
Baking soda (NaHCO3) reacts with acidic substances (HA) in cake batter in a double replacement reaction:…
In a laboratory experiment, a student reacted 2.8 grams of Fe (s) (steel wool) in excess CuSO4 (aq), according to the following balanced equation: Fe(s) + CuSO4 (aq) -> FeSO4 + Cu(S).…
The presentation should be engaging for the audience (you can direct it to a specific audience or your general community), and should summarize all of the important research and findings. The presentation should include:…
Balance this symbol equation for incomplete Balance this symbol equation for incomplete combustion of methane…
An ionic compound forms from a nonmetal and metal element. A covalent compound is formed by two non metal elements. A metallic compound is formed by two metal elements. Metallic compounds have generally high melting points, are loose and flexible with their electrons, conduct electricity well, and have low solubility in water. Ionic compounds are generally crystals, have a high melting point, and usually have high solubility in water and conduct electricity well when dissolved in water. Covalent compounds have individual molecules, have a low melting point, and do not conduct electricity, and their solubility in water depends on the type of covalent bond.…
Write an equation for one possible cracking reaction of the alkane C16H34 when the products include ethene and propene in the molar ratio 2:1 and only one other compound.…
1. One argument against continuing research on the atom is that the cost continues to increase at an alarming rate, and the benefits seem to be declining. Whereas quantum chemistry experiments as early as 80 years ago were very cheap and yielded considerable practical results, now very few if any practical results are emerging, but the costs of experiments continues to increase. On the other hand a common argument for the continued research in atomic and subatomic structure is the desire for a greater understanding of the universe. As we study the interactions of very small particles, we can gain a better understanding of how they work together to ultimately create the world we live in. Also there is a practical goal of understanding subatomic particles. Current data on how atoms and electrons interact is based on observation alone, and the reasons are unknown. For this reason, the predictions are occasionally vastly inaccurate when involved in larger systems. For example, we cannot predict the energy states of an electron accurately once the number of electrons goes above 1, if insight can be shed into the design of the particles that because the behavior we observe, it will be the most significant practical discovery since the discovery of chemistry itself.…
The definition for nuclear chemistry is the application of chemical techniques to the solution of problems in nuclear physics. This includes the discovery of naturally occurring and synthetic radioactive elements and the results of nuclear fission. There are both pros and cons in nuclear chemistry. People believe that nuclear chemistry is bad for the environment but there are a lot of great things that can come out of this. Things like medical uses, food and even in your own home!…
Argon (Ar) is a noble gas found in Group 0 on the periodic table. It gets its name because of its chemical inertness and comes from the Greek root ‘Argo,’ which means lazy. This is because Argon doesn’t react well with other elements. The atomic number of Argon is 18 making it a member of the helium group of elements which are also called noble, or inert, gasses and are non reactive. Its electronic configuration is:…
The specific three dimensional arrangements of atoms in molecules are referred to as molecular geometry. We also define molecular geometry as the positions of the atomic nuclei in a molecule. There are various instrumental techniques such as X-Ray crystallography and other experimental techniques which can be used to tell us where the atoms are located in a molecule. Using advanced techniques, very complicated structures for proteins, enzymes, DNA, and RNA have been determined. Molecular geometry is associated with the chemistry of vision, smell and odors, taste, drug reactions and enzyme controlled reactions to name a few. Molecular geometry is associated with the specific orientation of bonding atoms. A careful analysis of electron distributions in orbitals will usually result in correct molecular geometry determinations. In addition, the simple writing of Lewis diagrams can also provide important clues for the determination of molecular geometry. Click on a picture to link to a page with the GIF file and a short discussion of the molecule.…
Ozone depletion describes two distinct but related phenomena observed since the late 1970s: a steady decline of about 4% per decade in the total volume of ozone in Earth's stratosphere (the ozone layer), and a much larger springtime decrease in stratospheric ozone over Earth's polar regions. The latter phenomenon is referred to as theozone hole. In addition to these well-known stratospheric phenomena, there are also springtime polartropospheric ozone depletion events.…